James,
Debbie has a great reputation and is very skilled.
I know a lot of people that get the supplier to send the system to Debbie and then she mails it on to them.
Some of them then go to a local hairdresser to get a final trim but many say the system is ready to wear when they receive it.
I know you say its extra time & money, but it would be both of those things well spent if it avoids mistakes like the last time.

Your system will come with a pre shaped hairline which should be ok for you.
Most people don't need to get the front of the base cut or reshaped.